734 PROCEEDINGS OF THE ACADEMY OF [NoV., 



BASILICHTHYS Girard. 

 Proc. Acad. Nat. Sci. Phila., 1854, p. 198 (microlepidotus) . 

 Basilichthys regia (Humboldt and Valenciennes). 



Atherina regia Humboldt and Valenciennes,' in Humboldt and Bonpland, 

 Rec. Obs. Zool. Anat. Comp., II, 1833, p. 187. Surtout dans I'Ocean- 

 Pacifique, pres du Callao de Lima. 



Atherina latidavia Valenciennes, Hist. Nat. Poiss., X, 1835, p 351. Val- 

 paraiso. (M. d'Orbignv.) La lagune de Taguatagua du Chili. (M. 



Gay.) Cope, Proc. Amer. Philos. Soc, XVII, 1878, p. 44. Callao Bay. 



Peru. (Prof. James Orton.) 



Atherinichthys latidavia Ciunther, Cat. Fish. Brit. Mus., Ill, 1861, p. 402. 

 Salt water, Valparaiso. (Mr. Bridges.) Falkland Islands, Port Louis. 

 (Haslar Collection.) 



Chirostoma latidavia Steindachner, Zool. Jahrb., Suppl. IV (Fauna Chi- 

 lensis), 1898, p. 313. Tumbes (Talcahuano) . 



Head4|; depth 4|; D. VIII-I, 50; A. I, 18; P. I, 14; V. I, 5; scales 

 92 in lateral series to base of caudal; 50 before spinous dorsal; 16 in 

 transverse series between root of ventral and middle of back before 

 spinous dorsal; width of head 2\ in its length; depth of head 14; snout 

 3; eye 5^; tip of upper jaw to corner of mouth 5; to end of maxillary 

 3; interorbital space 3f ; length of depressed spinous dorsal 3; first 

 dorsal ray 2h; base of soft dorsal 2h; second anal ray 2|; base of anal 

 If; pectoral If; ventral 2f ; least depth of caudal peduncle 3^; length 

 of caudal peduncle, from base of last dorsal ray l\. 



Head large, elongate, compressed, greatest depth about tip of pec- 

 toral. Sides compressed, somewhat flattened, or only slightly convex. 

 Caudal peduncle elongate, compressed, its least depth near base of 

 caudal. 



Head elongate, conic, compressed, rather broad posteriorly so that 

 greatest width is about midway in postocular region, also widest part 

 of body. Side of head more or less flattened, though broadly con- 

 stricted below. Snout rather long, flattened above, and with jaws 

 produced some distance beyond. Eye small, high, not impinging on 

 upper profile, and posterior rim a little posterior in head. Adipose 

 eyelid slightly developed. Mouth rather small, horizontal, and jaws 

 equal. Maxillary expanded distally till f of pvipil, upper portion more 

 or less concealed below preorbital, and not reaching opposite front rim 

 of orbit. Teeth conic, rather large, and in two rather irregular series 

 in jaws. No teeth on vomer or palatines. Tongue small, narrow, 

 pointed, rather thick, and free in front. Mandible moderately large, 

 with each ramus well elevated inside of mouth. Lips thin. Anterior 



^ Credited to Humboldt on the authority of Valenciennes. The paper in which 

 this species is described is by these authors jointly, but later Valenciennes credits 

 to Humboldt. 



